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This commit implements the .tex-based online help system in LON-CAPA. It
may be necessary to manually run loncom/build/help_graphics_converter.pl
and doc/help/rebuildLabelHash.pl after a cvs update, and
loncapa_apache.conf may need to be manually copied to /etc. (The
loncapafiles.lpml has been updated.)

After merging this, the URL http://[loncapahost]/adm/help/Foils.hlp
should display a help file.

Also, some *very* out-of-date files have been removed from the /doc
directory.

Once you've defined variables in the \textbf{Script}, you can use them in
the \textbf{Text Block}. For example, using the previous three-line script
we've created so far, you can place the following in the \textbf{Text Block}:

\begin{lyxcode}
See~the~3:~\$variable<br~/>

See~the~string:~<b>\$stringVar</b><br~/>
\end{lyxcode}
%
\begin{figure}
\begin{center}\includegraphics{numericalResponseVarInText}\end{center}


\caption{Result of Variables in the Text Block\label{Result of Variables in the Text Block Figure}}
\end{figure}
If you save that and hit \textbf{View}, you should get what you see in figure
\ref{Result of Variables in the Text Block Figure}. Note how the {}``\$variable''
was turned into a 3, and the {}``\$stringVar'' was turned into {}``I have
a variable with the value 3.''